universal client plugin format

[Julmik]

Currently client plugins have separate versions for seperate OSes and they aren't on all platforms, but I reccommed to make new client plugins format that will be same on all platforms that supports them. It will allow to add client plugins to more platforms. I think that PC clients should support both new and old client plugin format.

[home_gaming]

plugins would have to either have all the versions bundled in like a zip file or be written in a platform-indipendent language like lua but that would affect preformance and it wouldnt be easy to make an api between classicube and the plugin